Two of my Marmande tomatoes were getting yellow leaves on the top of the plant. I read the posting about yellow leaves pointing up, and your suggestion to use Epsom Salts. I did so, and today my Marmandes are green and happy. Thank you! I would have hated to go to all the trouble of finding the French heirloom seed, starting it and babying it along, only to have it succumb. You saved my tomatoes!